US-20260126611-A1 - OPTICAL ELEMENT DRIVING MECHANISM

US20260126611A1US 20260126611 A1US20260126611 A1US 20260126611A1US-20260126611-A1

Abstract

An optical element driving mechanism is provided, which includes a first movable portion, a fixed portion, and a driving assembly. The first movable portion is used for connecting an optical element. The first movable portion is movable relative to the fixed portion. The driving assembly is used for driving the first movable portion to move relative to the fixed portion. The driving assembly can drive the first movable portion to move from a first state to a second state relative to the fixed portion, and the first state and the second state are included in a movable range.

Inventors

Yi-Ho Chen

Assignees

TDK TAIWAN CORP.

Dates

Publication Date: 20260507
Application Date: 20241105

Claims (20)

1 . An optical element driving mechanism, comprising: a first movable portion used for connecting an optical element; a fixed portion, wherein the first movable portion is movable relative to the fixed portion; and a driving assembly used for driving the first movable portion to move relative to the fixed portion; wherein the driving assembly can drive the first movable portion to move from a first state to a second state relative to the fixed portion, and the first state and the second state are included in a movable range.
2 . The optical element driving mechanism as claimed in claim 1 , further comprising a support assembly, wherein the first movable portion is movable relative to the fixed portion through the support assembly, and the support assembly comprises: a first intermediate element; a first support element corresponding to the first intermediate element and having a first recessed structure, wherein the first recessed structure is formed on a first surface; and a second support element corresponding to the first intermediate element and having a second recessed structure, wherein the second recessed structure is formed on a second surface.
3 . The optical element driving mechanism as claimed in claim 2 , wherein: the first intermediate element is at least partially disposed in the first recessed structure and the second recessed structure; the first recessed structure is different from the second recessed structure; the first movable portion is rotatable relative to the fixed portion around a first rotational axis, and the first rotational axis does not overlap a center of the optical element when viewed along the first rotational axis.
4 . The optical element driving mechanism as claimed in claim 3 , wherein: the first rotational axis does not pass through the optical element when viewed along the first rotational axis; the optical element includes an optical axis parallel to the first rotational axis; the second recessed structure is strip-shaped and extends along a first virtual line when viewed along a direction perpendicular to the second surface; a connection between the center of the optical element and the first rotational axis is not perpendicular to the first virtual line when viewed along the first rotational axis.
5 . The optical element driving mechanism as claimed in claim 4 , wherein: the first recessed structure comprises: a first corresponding surface corresponding to the first intermediate element; a second corresponding surface corresponding to the first intermediate element; and a third corresponding surface corresponding to the first intermediate element; the second recessed structure comprises: a fourth corresponding surface corresponding to the first intermediate element; and a fifth corresponding surface corresponding to the first intermediate element.
6 . The optical element driving mechanism as claimed in claim 5 , wherein: the second corresponding surface is not perpendicular to the first corresponding surface; the third corresponding surface is not parallel to the first corresponding surface; the third corresponding surface is not parallel to the second corresponding surface; the fourth corresponding surface is not parallel and not perpendicular to the first corresponding surface, the second corresponding surface, and the third corresponding surface; number of surfaces of the first recessed structure that correspond to the first intermediate element is more than number of surfaces of the second recessed structure that correspond to the first intermediate element; distances between a center of the first intermediate element and a center of the first recessed structure when viewed along a direction perpendicular to the first surface are identical when in the first state and when in the second state.
7 . The optical element driving mechanism as claimed in claim 4 , wherein: the first recessed structure comprises: a first corresponding surface corresponding to the first intermediate element; and a second corresponding surface corresponding to the first intermediate element; the second recessed structure comprises: a fourth corresponding surface corresponding to the first intermediate element; and a fifth corresponding surface corresponding to the first intermediate element; the second corresponding surface is not parallel to the first corresponding surface; the fifth corresponding surface is not parallel to the fourth corresponding surface.
8 . The optical element driving mechanism as claimed in claim 7 , wherein: the fourth corresponding surface is not parallel to the first corresponding surface and the second corresponding surface; the fourth corresponding surface is not perpendicular to the first corresponding surface and the second corresponding surface; the fifth corresponding surface is not parallel to the first corresponding surface and the second corresponding surface; the fifth corresponding surface is not perpendicular to the first corresponding surface and the second corresponding surface; distances between a center of the first intermediate element and a center of the first recessed structure when viewed along a direction perpendicular to the second surface are different when the first movable portion is in the first state and in the second state.
9 . The optical element driving mechanism as claimed in claim 8 , wherein: the support assembly further comprises: a first main body, wherein the second surface is formed on the first main body; a first strengthen element disposed on the second recessed structure, and the fourth corresponding surface is formed on the first strengthen element; a positioning portion extending from the first surface; and a force applying element used for generating a stabilizing force that keeps the first movable portion and the fixed portion in close contact with the first intermediate element.
10 . The optical element driving mechanism as claimed in claim 9 , wherein: a hardness of the first main body is less than a hardness of the first strengthen element; the positioning portion surrounds a portion of the first intermediate element; the force applying element comprises magnets, and the first strengthen element comprises a magnetically permeable material; the force applying element comprises a force applying element surface facing the first intermediate element; the force applying element surface is not parallel and not perpendicular to the fourth corresponding surface; the force applying element surface is not parallel and not perpendicular to the fifth corresponding surface; the force applying element surface faces the first strengthen element.
11 . The optical element driving mechanism as claimed in claim 4 , further comprising a sensing assembly used for sensing movement of the first movable portion, wherein the sensing assembly comprises: a first sensing element used for detecting a movement of the first movable portion along a first axis; and a second sensing element used for detecting a movement of the first movable portion along a second axis.
12 . The optical element driving mechanism as claimed in claim 11 , wherein: the first axis is not perpendicular to a connection between the center of the optical element and the first rotational axis when viewed along the first rotational axis; when the first movable portion is at an initial position, the first sensing element outputs a first initial value, and the second sensing element outputs a second initial value; when the first movable portion moves from the initial position to a first position along the first axis, the first sensing element outputs a first sensed value, and the second sensing element outputs a second sensed value; when the first movable portion moves from the initial position to a second position along the second axis, the first sensing element outputs a third sensed value, and the second sensing element outputs a fourth sensed value.
13 . The optical element driving mechanism as claimed in claim 12 , wherein: degree of movement of the first position relative to the initial position is the same as degree of movement of the second position relative to the initial position; difference of absolute value between the second sensed value and the second initial value is different from difference of an absolute value between the third sensed value and the first initial value.
14 . The optical element driving mechanism as claimed in claim 13 , wherein: the difference of absolute value between the second sensed value and the second initial value is greater than the difference of absolute value between the third sensed value and the first initial value; the first movable portion is movable along the first axis in a first limit range; the initial position is at a center of the first limit range; the difference of absolute value between the first position and the initial position is at least greater than one-fourth of the first limit range; difference of absolute value between the first sensed value and the second sensed value is different from difference of the absolute value between the third sensed value and the fourth sensed value.
15 . The optical element driving mechanism as claimed in claim 3 , wherein: the fixed portion comprises a bottom; the bottom comprises a second main body; the support assembly further comprises: a second intermediate element disposed between the fixed portion and the first movable portion; a third intermediate element disposed between the fixed portion and the first movable portion; a third strengthen element disposed on the bottom; and a fourth strengthen element disposed on the bottom.
16 . The optical element driving mechanism as claimed in claim 15 , wherein: the optical element comprises an optical axis; the second intermediate element and the third intermediate element at least partially overlap the first movable portion and the bottom; the first movable portion comprises a second accommodating space and a third accommodating space; the second intermediate element is at least partially disposed in the second accommodating space; the third intermediate element is at least partially disposed in the third accommodating space.
17 . The optical element driving mechanism as claimed in claim 16 , wherein: a size of the second accommodating space is greater than a size of the second intermediate element when viewed along the optical axis; a size of the third accommodating space is greater than a size of the third intermediate element when viewed along the optical axis.
18 . The optical element driving mechanism as claimed in claim 17 , wherein: the third strengthen element corresponds to the second intermediate element; the fourth strengthen element corresponds to the third intermediate element; the third strengthen element is partially embedded in the second main body; the third strengthen element is partially exposed from the second main body; the fourth strengthen element is partially embedded in the second main body; the fourth strengthen element is partially exposed from the second main body; hardness of the second main body is less than hardness of the third strengthen element and hardness of the fourth strengthen element.
19 . The optical element driving mechanism as claimed in claim 1 , further comprising an intermediate assembly and a second movable portion; wherein: the second movable portion is movably connected to the fixed portion; the second movable portion is movably connected to the first movable portion; the second movable portion is disposed in the first movable portion; the intermediate assembly comprises: a first intermediate unit affixed on one of the first movable portion and the second movable portion; a second intermediate unit affixed on one of the first movable portion and the second movable portion; a first auxiliary magnetic element corresponding to the first intermediate unit; and a second auxiliary magnetic element corresponding to the second intermediate unit.
20 . The optical element driving mechanism as claimed in claim 19 , wherein: the second movable portion is partially disposed between the first intermediate unit and the first auxiliary magnetic element; the second movable portion is partially disposed between the second intermediate unit and the second auxiliary magnetic element; the first intermediate unit comprises a magnetically permeable material; the second intermediate unit comprises a magnetically permeable material.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present disclosure relates to an optical element driving mechanism. Description of the Related Art As technology has developed, it has become more common to include image-capturing and video-recording functions into many types of modern electronic devices, such as smartphones and digital cameras. These electronic devices are used more and more often, and new models have been developed that are convenient, thin, and lightweight, offering more choice to consumers. Electronic devices that have image-capturing or video-recording functions normally include an optical system to drive an optical element (such as a lens) to move along its optical axis, thereby achieving auto focus (AF) or optical image stabilization (OIS). Light may pass through the optical element and may form an image on an optical sensor. However, the trend in modern mobile devices is to have a smaller size and a higher durability. As a result, how to effectively reduce the size of the optical system and how to increase its durability has become an important issue. BRIEF SUMMARY OF THE INVENTION An optical element driving mechanism is provided, which includes a first movable portion, a fixed portion, and a driving assembly. The first movable portion is used for connecting an optical element. The first movable portion is movable relative to the fixed portion. The driving assembly is used for driving the first movable portion to move relative to the fixed portion. The driving assembly can drive the first movable portion to move from a first state to a second state relative to the fixed portion, and the first state and the second state are included in a movable range. In some embodiments, the optical element driving mechanism further includes a support assembly, wherein the first movable portion is movable relative to the fixed portion through the support assembly, and the support assembly includes a first intermediate element, a first support element corresponding to the first intermediate element and having a first recessed structure, and a second support element corresponding to the first intermediate element and having a second recessed structure. The first recessed structure is formed on a first surface. The second recessed structure is formed on the first surface. The first intermediate element is at least partially disposed in the first recessed structure and the second recessed structure. The first recessed structure is different from the second recessed structure. The first movable portion is rotatable relative to the fixed portion around a first rotational axis, and the first rotational axis does not overlap a center of the optical element when viewed along the first rotational axis. BRIEF DESCRIPTION OF THE DRAWINGS Aspects of the present disclosure are best understood from the following detailed description when read with the accompanying figures. It should be noted that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion. FIG. 1A is a schematic view of an optical element driving mechanism. FIG. 1B is an exploded view of the optical element driving mechanism. FIG. 1C is a top view of the optical element driving mechanism. FIG. 2A is a cross-sectional view illustrated along a line A-A in FIG. 1C. FIG. 2B is a cross-sectional view illustrated along a line B-B in FIG. 1C. FIG. 2C is a cross-sectional view illustrated along a line C-C in FIG. 1C. FIG. 3A is a top view of some elements of the optical element driving mechanism. FIG. 3B is a top view of some elements of the optical element driving mechanism. FIG. 4A is a cross-sectional view illustrated along a line D-D in FIG. 3B. FIG. 4B is an enlarged view of a region area in FIG. 4A in some embodiments. FIG. 4C is an enlarged view of the area of FIG. 4A in other embodiments. FIG. 4D is a schematic view of the bottom and the first intermediate element. FIG. 5A and FIG. 5B are schematic views showing the positional relationships of some elements when the first movable portion is in the first state and the second state relative to the fixed portion, respectively, when a first recessed structure having a cylindrical shape is used. FIG. 5C is a schematic view showing the positional relationships of some elements when the first movable portion is in the first state and the second state relative to the fixed portion, respectively, when a first recessed structure having a triangular shape is used. FIG. 6A, FIG. 6B, and FIG. 6C are top views of some elements of the optical element driving mechanism FIG. 7A, FIG. 7B, FIG. 7C, and FIG. 7D are schematic views showing sensor signal values output when the first movable portion moves relative to the fixed portion. DETAILED DESCRIPTION OF THE INVENTION The following disclosure provides many different embodiments, or examples, for implementing